Answer:
Explanation:
The correct pairing of the homologous chromosomes and their correct segregation (a chromosome for each daughter cell) are key to the proper development of the new cells, and specially of the new individual if we are talking about the early stages of embryogenesis. If there is an error during the splitting of chromosomes, and one cell gets a double set and the other misses a chromosome, numerical chromosomal abnormalities occur. These numerical abnormalities can happen on autosomes or sexual chromosomes, and common examples are as Down Syndrome (trisomy 21), Patau Syndrome (trisomy 13), Turner Syndrome (45,X) and others.
The number of the trisomy indicates the chromosome pair that suffered the adding or the subtraction of its chromosome.
Answer:
Nitrogen fixing bacteria
Explanation:
Nitrogen fixing bacteria convert atmospheric nitrogen into ammonia or nitrate, which can be directly utilized by plants.
A - Rough Endoplasmic Reticulum - sheet-like internal membrane filled with ribosomes where protein synthesis takes place
B - Cytoplasm - gel-like matrix that contains all the organelles
C - Golgi Complex - collects molecules, packages them inside vesicles, stores the formed molecules or distibutes them in the cell.
D - Nucleolus - produces ribosomes
E - Nucleus - the brain of the cell; controls all the processes in the body
F - Mitochondrion - where oxidative metabolism happens, produces energy from food
G - Smooth endoplasmic reticulum -tubular shaped internal membrane where lipids and steroids are stored
H - Peroxisome - contains important enzymes to be used in various metabolic reactions
I - Plasma Membrane - encloses the contents of the cell, made up of lipids and proteins
Mutualism when both parties benefit: Could be walking the dog to get exercise while giving the dog exercise. Or washing a pet so the pet is clean and they dont smell bad to you anymore <span />